Looper mechanism for sewing machines



Feb. 10, 1931. J. BERGER 1,792,353

LOOPER MECHANISM FOR SEWING MACHINES Filed Nov. 24 1922 6 Sheets-Sheet l Zinoewtoz Feb. 10, 1931. J. BERGER LOOPER MECHANISM FOR SEWING MACHINES Filed Nov. 24. 1922 6 Sheets-Sheet 2 Feb. 10, 1931. J, BERGER l,792,353

LOOPER MECHANISM FOR SEWING MACHINES Filed Nov. 24, 1922 6 Sheets-Sheet 3 Feb. 10, 1931. J. BERGER 1,792,353

LOOPER MECHANISM FOR SEWING MACHINES FiledNov. L24, 1922 6 Sheets-Sheet 4 Feb. 10, 1931. BERGER 1,792,353

LOOPER MECHANISM FOR SEWING MACHINES Filed Nov. 24, 1932 6 Sheets-Sheet 5 Feb. 10, 1931. J. BERGER.

LOOPER MECHANISM FOR SEWING MACHINES Filed Nov. 24, 1922 6 Sheets-Sheet 6 Patented Feb. 10, 1931 V UNITED STATES JOSEPHIBERGER, F UTICAQNEW Yonmirissreivon TQUITIONSPECIAL MACHINE can,

PANY, or CHICAGO, ILLINOIS,

A oonroRATIon on ILLINOIS LoorEn MECHANISM non snwrlve MACHINES Application filed November 24, 1922. Serial my 602,990.

The invention relates to new-and useful improvements in looper mechanisms for sewing machines,-and more particularly to "a'inecha-nism forosc'illating the thread'car- -rying looper and giving adwell thereto" at the forward end of its stroke, or'while'th looper-is in the needle thread loop.

An object of-the invention is to provide a looper operating mechanism of the above type, wherein the looper is given an extendeddwell substantially during the entire period that the needle is above the work support,

and wherein the looper is moved very quickly into and out of the needle loop sothatfl'the stroke of the looper does not have tobe uh duly shortene'd.

A further object of the inventionis to pro vide a looper operating mechanism of the above type wherein the looper carrierispro vided with a radially extending arm, and a sleeve slidably mounted on said'arm is also caused to travel 111 a curved path so as to impart oscillations to the looper and give an extended dwell thereto while said looper in the needle thread loop. 7

A still further object of the invention is to provide a looper operating mechanism of the above type wherein the means which moves the sleeve back and forth is mounted on the looper support which carries the looperand is oscillated with said looper sup port when the looper is moved laterally to avoid the needle.

These and other objects will in part be ob vious and will in part be hereinafter more fully disclosed. i a

In the drawings which show by way of illustration one embodiment of the inven tion- Figure 1 is a front View of a portion of a machinewith the cloth plate removed, en

bodying the invention; Fig. 2 is an end view of thesame;

, Fig. 3 is a plan view of the looper .operat ing mechanism with the looper at the rear end of its stroke;

Fig. 4 is a similar view but with the looper at the forward end of. its stroke and at the beginning of its dwell in the needle loop Fig. 5 is a similar View but showing the sleeve" as moved to the 'extreme'onter posi-' tion onthe looper oscillating arm 1 I Fig. 6 is aside View of the parts ,positio asinFig.3;- I Fig. 7 is a side view of theparts positioned" as in Fig. 4; Y 7 Fig. 8 is aside .viewof the parts positioned -asinFig "5; a 1 Fig. '9 is a diagrammatic view showing the" movements of the looper into and out 0f the needle loop;

F ig.. 10. is a view partly in section and partly in end elevation, showing the looper carrier as moved, laterallyto-give the looper a needle avoiding movement 5 Fig. 11' 's a hori ontal sectional view showing the upper loop forming mechanism with thej parts aspositioned when the needles are at the lower ends of their strokes Fig. 12 is a similar view but showingthe loop forming members in engagement with" showing the loop as completely formed and held forthe right'hand needle, and i Fig. 14: is a view showing in plan the work,

support and the devices for guiding the material for stitching the sweat band of a hat.@

g The invention is directed riminy'ma looper operating means for moving a thread carrying looper into and out of a needle.

new form of loop forming mechanismwhich I prefer to use when my improved looper operating mechanism'is used for forming covering stitches The looper operating mechanism consists of a pivoted carrier on which the threaded looper is mounted, a

looper support on which the carrier is pivso disposed that the sleevewhich is pivoted. thereto moves in a curved path from a position where the sleeve slides horizontally or substantially so on the radial arm, to a positionv where the radial arm is substantially vertical. This gives to the. looper a very quickimovement into; andout of the'needle thread loop, or the loops of the needlei'h'reads when more than one needle is used, and a relatively long dwell while in the needle thread peflie. .f; l l. i f

Referring more in detail to the drawings, Lhave shownmy improvementas applied to a sewing machine provided with a bed plate 1 and the usual overhanging arm 2. Mounted to reciprocate in the overhanging arm 2 is a needle bar 3 carrying two needles 4 and 5. These needles are set so that the point of the needle 4 'is much lower than the point of theneedle 5. The material is held on the work support-indicated at 6 by means of a presser foot 7, and isfed across the work support by means of a feed dog 8 carried by the feed bar. 9- which is given the usual four'motions for feeding the material- Cooperating with the two needles beneath the work support is asingle looper 10. This looper 10'is rigidlysecured to. a looper carrier 11. ,ThelQOper carrier 11 is provided with a shortshaft 12 which is journaled in a bracket 13. Said bracket 13 has spaced bearings 14 andjl5 forisaid Located on the shaft between the bearings 14 and 15is a. sleeve 16 which is provided with an arm 17. Said arm projects radially from the axis of the shaft and willbe hereinafter referred" to {its a radially extending arm;

Mounted on the radially extending arm 17 is fa sleeve 18. This sleeve 18 is provided with a laterallyextending supporting shaft 19Qwhich in turn is ,pivotally supported in a. bearing 20. This bearing 20 is carried at the upper-end'of alever 21. The sleeve is free tooscillate in a vertical plane on the lever 2landfis also free to slide back and forth on the radial arm 17.. The lever 21 isvibrated bya link 22 which is connected tothe' usual needle 'lever extensionl The lever 21' is pivoted at23 on a depending arm-24 carriedby the bracket13. The bracket 13 is mounted on a shaft 25 and securedthereto by set'screws 26, 26. The shaft 25 is oscillated in the usual manner from an eccentric 'on main shaft and this imparts the lateral movements to the looper or gives thereto its well known needle avoiding movement. It will be noted that when the looper is'moved laterally from its needle avoiding movement, the lever 21 and sleeve 18 also move laterally.

In other words, the means'which actuates the looper moves bodily with the looper during its lateral movements. lVhen the link 22 is moved endwise it will-oscillate thelever 21 and tl e-pivoial point oflever 21-isso disposed relative to the'pivotalpoint of the looper carrier that the sleeve will slide back and forth on theradial arm 17, moving in substantially a horizontal line when the looper is at the forward end of its stroke, and

whenthe lever 21-is at the right hand end of its stroke, as viewed'in Fig; 6, the radial arm is substantially vertical. Referring'to Fig. 9, the broken llDG' aa ndicates the path ofmovement of the "pivotal support for the, sleeve on the lever21.-' The sleeve" moves from they point x to the-point y. As

the sleeve movesfrom'the point m-to the point a, it is traveling in substantially a hori z ontal plane, or at least, in that portionof the are of its travel a'a, that will impart little or no oscillating movements to the looper, From the point a to the point a, the sleeve will give the entire oscillating move-'' ment to the; looper. lVheninoving from the point a to the point y, the looper is retracted from the needle thread loop, and when moving from the point y to the point a, the looper is; moved "forward into the needle thread loop. Between the points eand y, the center of the shaft 19 carrying the sleeve 20 approaches the axis of the shaft 12 whichcarriesthe looper; t will be obvious therefore, that the looper is given its highest speed of travel for a given angular movement of the lever 21just as it is about-to'eni'er the needlefthread loop, and while it is leaving the'needle' thread loop. This is particularly desirable'in a two-needle machine, as it enables the looperto catch both of the needle threadloops. It will therefore be noted that I have provided a means which gives tothe looper a very quick travel into and out of the needle loop and withoutshortening the throw of the looper which travels through an; arc of approximately ninety degrees, and at the same time, my improved means gives to the looper an extended dwell while in the needle thread loop. The extent of dwell is substantially during the entire period that the needles are above the work support. This enables boih the needles to enter with certainty into the thread triangle, and it enables the looper to oassinto both needle thread loops without skippingany stitches. The needles are set at different heights to facilitate the looper taking :both needle thread loops- While I, have shownthe looper operating atin'gi'with two needles, it will be under-- stood of course, that-said looperoperatingmechanism may be used in a single needlemachine, and for the purpose of description,

I have referred to a single needle thread. In order that the needles maybe properly posi- 7 tioned so that the looper will enter intoboth tered by the right hand needle. My irn-l proved loop forming mechanism consists of needle threadloops, I have provided a needle guard 27 carried by a collar 28 fixed by a'set I screw '29 to the shaft 25. As this shaft oscillates to bring the looper into position to pass the needles-and enter'the needle thread loops,,the needle guard will also move up into position so as to properly place the s; needles,i'f they are for any reason deflected.

' My improved looper operating mechanism is especially 'adapted'for a two-needle machine for forming over edge or covering stitches, "and to this end, I have provided a loop forming mechanism "for forming the left hand needle thread into a loop to be en apositioning finger 30 carried by a. lever 31 pivot'ed'to a'bracket32 mounted on a'presser bar 33 which carries thepresser foot 7. Said lever 31 is mounted to move in a plane sub.-

stantially parallelto the line of feed and thus carry the finger 30'from a positionin rear of the needles toga position in front of the needles. The lever 3 1 is so timed that this'finger 30 crosses the path of the needle while the needle is up, engages theneedle thread of the left hand needle, and moves it forward into; thepath of the loop forming hook 34-; Said loop'forming hook 34 is carried by a lever 35. The lever 35 is mounted on a bracket'36 carried at thelower end of .the auxiliary presser bar 37 which moves up and down with the 'main presser bar 33. The

pivotal support 38 of the lever 35 is at the left-hand side of the center of the auxiliary presser bar. As a result, the hook 34 moves closer to the right-hand needle than to the left-hand needle, and this enables the hook.

to engage the left-hand needle thread moved forward by the positioning finger, and form a loop therein and position said loop for the ..right-hand needle to enter. The lever 35 as well as the lever 31 moves up and down with the presser bars and will therefore, always have a fixed relation to the presser foot in their oscillations. The lever 31 is oscillated .by a link 39 which is connected to a'collar 40 on the needle bar. As the needle bar reciprocates, it will oscillate this lever. The lever 35 is oscillated by means of a link 41 which is connected to an arm 42 attached to a shaft ;43 mounted on the overhanging arm and the. shaft 43 is in turn oscillated by an eccentric strap 44 cooperating with an eccentric on the main shaft 45. The eccentric strap 44 has an adjustable connection with an arm- .46 attached to the shaft 43 so that the throw "of the book may be varied.

My improved stitching mechanism is es-& pecially-adapted for stitching hat sweats or v fordoing the-type of work "disclosed'in the I patent to Hughes No. 1,257,239,grantedFebru'ary 19, 1918.'

Referring to Fig. 14, itwill be noted that the machine is provided with a guide 47 which receives the edge of, the sweat band that is to pass between the needles, so that one needle will enter. the sweat band and the other needle pass overthe edge of the sweat band."

The swinging yielding guide 48 engages theother edge of the hat sweat and holdsit fwell in the. guide 47. Thereedpasses through a covering strip indicated at G. This reed covering strip passes through a folder 50' which folds the covering strip about ther'eed and directs thereedIand-covering strip to the stitching mechanism so that the reed'passes between the needles and along the edge'of thehat sweat. The covering stitches encircle the reed and the edge of the covering strip, and join the same to theha-t sweat,

It is obvious that minor changes in the details of construction and the arrangement g ide 49 whichdirectsthe reed into a reed of the parts may be made without oleparting-from the spirit of the invention as set i forth in the appended claims. 7

Having thus described the invention, what I claim as new and desire to securev by Letters Patent, is"- 1. The combination of a looper, a. pivoted slide on said arm without imparting any appreciable movement to the looper.

2. The combination of-a looper, a'pivotedlooper carrier for said looper having an arm projecting substantially radially from the carrier, a sleeve slidable on said arm, a pivotedlever carrying said sleeve andmounted upon an axis parallel to and spaced from the pivotal axis of the looper so that said sleeve moves bodily in a curved path from a substantially vertical position to ahori'zontal position, and slides freely onsaid arm while.

said armis horizontal so as to give an-extended dwell .to the looper when nearerward end of the looper stroke.

3. The combination of a looper, a pivoted looper carrier for said looper having an arm projecting.substantially radially from the carrier, a sleeveslida-ble on said arm, a pivoted lever carrying said sleeve and mounted upon an axis parallel to and spaced from l the pivotal-axis of the looperyso that said sleeve movesbodilyina curved path from a substantially vertical position to a horizon tal pos1t1on, slides freely on-sald arm whensaid arm s horizontal so as to g ve an extended dwell .to the looper when at the forward end of, the looper stroke, and means for. bodily moving saidlooper, said lever and said sleeve laterally for giving said looper a needle avoiding movement.-

l, The combination of a looper, ailooper;

carrier, a looper support on which said carr1er'1s plvotally mounted, said looper carrier having a substantially radially extendmg arm, a sleeve slidablej on said arm, and.

means for moving said sleeve ina curved path for moving said radial armfroma -suostantially vertical position to a horizontal pos1t1on, said sleeve sl1d1ng on sa d 'arm when inhorizontal pos1t1on for giving an extended dwell to the looper at the forward end of the looper stroke.

5. Thecombination of a looper, a carrier, a looper support on which said carrier is pivotally mounted, said looper carrier having a substantially radially extend ing arm, a sleeve slidable on said arm, a lever pivotally -mounted on said looper support and pivotally supporting said sleeve, means for oscillating said lever, and means for moving said support for giving the looper a needle avoiding movement.

6. The combination of a looper, a looper 7 carrier, a looper support on which said carrier ispi'votally mounted, saidlooper carrier having a substantlally rad1allyextendver pivotally mounted on said looper support and pivotallysupporting said sleeve,

means for oscillating said lever, and means for-moving said support for giving the loop-.

er a needle avoiding movement, said lever being pivoted to said support at a point at one side of the pivotal support of the looper carrier whereby said sleeve is caused to slide on said radial arm and give vto the looper an extended dwell when at the forward end of the looper stroke.

7 The combination of a looper, a looper slides back and forth thereon giving an ex-- 7 tended dwell to the looper, and whereby said radially extending arm is substantially vertical when thelooper is at therear end of its stroke, means for oscillating said-lever,

lo oper mg arm, a sleeve slidable on said arm, a le-' and means for oscillating the looper support for givinga lateral or needle avoiding movement to the; looper.

8.'A sewing machinelncluding in combination, two needles arranged abreast, a looper cooperating with both needles, a pivotedlooper carrier, a substantially radially extending arm mounted on said carrier, a-

sleeve slidable'upon said arm, meansv for, supporting andmovlng sald sleeve bodlly- 1n a plane at right angles to the pivotal support of the looper, for causing the looper to 1 move quickly out of and into, the needle thread loops, said sleeve sliding on' said arm when the looper is at the'forward end of the looper stroke for giving an extended dwell thereto while in the needle thread loops.

9. vThe combination of a looper, a looper carrier, means for supporting said looper carrier whereby the samexmay osc llate about an axis for impartmg to the looper itsloop taking and loop shedding'movements, a mem-. ber, means for supportlng' said member wherebylthe same may be moved backand forth and in .:a path which approachesthe pivotal axis ofthe looper carrier, and moves away from the same between the ends of its;

movements, saidearrier having means for connection with said member whereby the bodily movement of said member imparts oscillations to said carrier, and devices independent of said looper carrienoscillating meansfor imparting to'the looperneedle avoiding movement. 1 q

In testimony whereof, I affix mysignature.

J OSEPI-I BERGER 

